How to Increment by 1 to all the Digits of a given Integer in PHP ?
Last Updated :
09 Jul, 2024
In PHP, incrementing all digits of an integer by 1 involves breaking the number into individual digits, adding 1 to each, and reconstructing the integer. This can be accomplished through array manipulation, arithmetic operations, or string conversion methods. Suppose, if the given number is 123 then the desired output is 234.
Examples:
Input: 12345
Output: 23456
Input: 110102
Output: 221213
Using String Conversion
Generate a string which will be of the same length as the input integer and will contain only 1's in it. Then we will convert this string into an integer. Then, finally add this integer to the original integer to get the desired result.
Example: Illustration of incrementing by 1 to all the digits of a given integer in PHP using string conversion method.
PHP
<?php
// Declaring the number
$number = 110102;
echo "Original Number: $number \n";
// Number of digits in the number
$len = strlen((string) $number);
// Generating the addition string
$add = str_repeat("1", $len);
// Converting it to an integer
$str_num = (int) $add;
// Adding them and displaying the result
$result = $number + $str_num;
// Print the result
echo "Incremented Number: $result";
?>
OutputOriginal Number: 110102
Incremented Number: 221213
Using Arithmetic Operations
Take an integer with value 1. Then we will perform arithmetic operations on it to get an integer of only 1s which will be of same length as that or original integer. Then, finally we will add this integer to original integer to get the desired result.
Example: Illustration of incrementing by 1 to all the digits of a given integer in PHP using arithmetic operations.
PHP
<?php
// Declaring the number
$number = 1920;
echo "Original Number: $number \n";
// Number of digits in the number
$len = strlen((string) $number);
// Declaring another variable with value 1
$add = 1;
for ($i = 0; $i < $len; $i++) {
// Adding variable $add and $number
$number = $number + $add;
// Multiplying the value of $add with 10
$add = $add * 10;
}
// Printing the result
echo "Incremented Number: $number";
?>
OutputOriginal Number: 1920
Incremented Number: 3031
Using Array Manipulation
Create an array with value of all elements equals to 1. Then, merge all elements of array together into a string and then convert this string into a number. Finally, add this number to the original given integer to get the result.
Example: Illustration of incrementing by 1 to all the digits of a given integer in PHP using array manipulation method.
PHP
<?php
// Declaring the number
$number = 2024;
echo "Original Number: $number \n";
// Converting the number to an array of digits
$num_arr = str_split(strval($number));
// Counting the number of elements n numberArray
$len = count($num_arr);
// Creating an array of 1s with the length = len
$ones_arr = array_fill(0, $len, 1);
// Joining all array elements to form a string of 1s
// with length len and then convert it to an integer
$str_num = (int) implode("", $ones_arr);
// Adding them and displaying the result
$result = $number + $str_num;
// Print the result
echo "Incremented Number: $result";
?>
OutputOriginal Number: 2024
Incremented Number: 3135
Using Direct Digit Manipulation
In this method, we break down the integer into its individual digits, increment each digit by 1, handle any carry that might occur due to digits reaching 10, and then reconstruct the integer.
Example: Illustration of incrementing each digit by 1 to all the digits of a given integer in PHP using direct digit manipulation.
PHP
<?php
// Function to increment each digit by 1
function incrementDigits($number) {
// Convert the number to an array of digits
$num_arr = str_split(strval($number));
// Increment each digit by 1
for ($i = 0; $i < count($num_arr); $i++) {
$num_arr[$i] = ($num_arr[$i] + 1) % 10;
}
// Join the array back into a string
$incremented_number = implode("", $num_arr);
// Convert the string back to an integer
return (int) $incremented_number;
}
// Declaring the number
$number = 1920;
echo "Original Number: $number \n";
// Incrementing each digit
$result = incrementDigits($number);
// Print the result
echo "Incremented Number: $result";
?>
OutputOriginal Number: 1920
Incremented Number: 2031
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